THE IDLEE ON MY CAR GOES UP AND DOWN FEELS LIKE IT WANTS TO SHUT OFF I'VE REPLCE MASSS AIR FLOW SENSOR,TPS SENSOR AND THEIDLE AIR CONTROL VAVEL BUT STILL DOING THE SAME THING. THE CAR DOES HAVE A SMALL EXHAUST LEAK I DONT KNOW IF IT HAS ANYTHING TO DO WITH IT. I AM OUT OF IDEAS CAN YOU GIVE ME ANY ADVICE THANK YOU.